Apparatus for inspecting glass



,. D. H. BOGGS APPARATUS FOR INSPECTING GLASS Filed Deo.

Sept. 25, 1934.

IVI

Patented Sept. 25, 1934 y Pennsylvania Application Decemberz, rss2, seri-a1 No. 648,468

The invention relates to apparatus for inspectingflat glass. '-It is'particularly designed for inspecting rough plate glass as4 it comes from a roller leer, and is so illustrated and described, but

it will be understood that the invention is not eyes. Briey stated, this is accomplished by directing the light through the glass at an acute angle and shielding the inspector on the side of the glass opposite tothe source of illumination from all direct rays from such source. One emfbodiment of the invention is illustrated in the accompanying drawing wherein:

Figure 1 is a plan view of the apparatus. Fig. 2 is a vertical section on the line II--II of Fig. 1. Fig. 3 is an" enlarged section on the line III-III nii of Fig. 2. And Fig. 4 is an enlarged section on the line IV--IV of Fig. 2.

Referring to the drawing, 1 and 2 are a pair of rolls constituting a part of a roller conveyor leading from a roller leer, such as is well known in the art. Lying between and below these rolls, is a sheet metal casing made up of the side plates 3, 3 and the end plates 4, 4, such casing being supported by suitable means which are not shown, and being of a length somewhat greater than the "Ejwidth of the glass sheet 5 which is to pass along the roller conveyor above the casing and. be inspected.

Mounted in the bottom of the casing is a pair of mercury vapor lamps 6, 6,for which other suitable jlighting means might be substituted, if desired. Located in the casing above the lamp is a shutter consisting of a series of parallel sheetmetal plates 7, '7, 7, etc. lying at an acute angle to the plane of the glass sheet 5. The plates are stiffened at their edges by the angles 8 and are pivoted on hinge bolts 9, so that the angle of the plates may be adjusted to suit requirements. The plates are connected and maintained in parallelism by the tie bar 10. The screw rod 11 extending through the end member of the series of plates and through a bracket 12 carried by the casing serves as a means for adjusting the angle of the plates and fixing them in adjusted position.

The upper face of each of the shields or plates 517 is preferably painted a flat black color, `while 7' claims. (01." 885-14) thelower' sides are" painted a glossy white. It

willbeunderstood, however,'that the coloring of the plates may bei'modifiedf depcndingon re-J quirements as vdictated by the character of the glass inspected and the kind of lighting means employed below the shutter. 'I'he space between the last plate 7 of the series and the end plate 4 of the casing, is closed by a plate 13 (Fig. 2), and a mirror 14 reflects light from the lamps onto the light vane 15, which is adjustable as to angle and has its lower portion painted a glossy White, so as to reiiect the light against the white faces of the plates 7.

In using the apparatus, the inspector stands above the moving sheet of glass, and marks the defects therein as the sheet moves over the illumi#` nated area above the shutter dened by the casing. The light from the lamps 6, 6 provides direct illumination for all parts of the glass lying aboveV the shutter, but since this light passes through at an acute angle, the inspector who is directly above the shutter can not see the lamps which thus illumine the glass without shining into his eyes. The only reflected light passing upward is the small amount from the black upper faces of the shields, so that there is substantially no glare.

'The angular application of the light also seems to bring out any defects in the glass more clearly than light which is applied at right angles, so that a maximum illumination is secured and without glare or strain upon the eyes of the operator.

What I claim is:

1. In combination with a horizontal carrier comprising spaced rolls adapted to carry a sheet of glass thereover, inspection means comprising a shutter made up of a series of parallel shields extending transversely of the roles lying at an acuteangle to the glass and located between a pair of said rolls below the level thereof, and lighting means below the shutter.

2. In combination with a horizontal carrier comprising spaced rolls adapted to carry a sheet of glass thereover, inspection means comprising a shutter made up of a series of parallel shields extending transversely of the rolls lying at an acute angle to the glass and located between a pair of said rolls below the level thereof, and lighting means below the shutter, said shields being adjustable as to angle.

3. In combination with a horizontal carrier comprising spaced rolls adapted to carry a sheet of glass thereover, inspection means comprising a shutter made up of a series of parallel shields extending transversely of the rolls lying at an acute angle to the glass and located between a pair of said rolls below the level thereof, and lighting means below the shutter, said shields being adjustable as to angle, and connected so as to maintain them in parallelism when adjusted.

4. In combination with a horizontal carrier comprising spaced rolls adapted to carry a sheet of glass thereover, inspection means comprising a shutter made up of a series ofparallel shields extending transversely of the rolls lying at'an acute angle to the glass and located between a pair of said rolls below the level thereof, and

lighting means below the shutter, said shields f comprising a series of parallel members spaced having a dull finish on their upper surfaces.

5. In combination with a. horizontal ,carrier comprising spaced rolls adapted to carry a sheet of glass thereover, inspection means comprising a shutter made up of a series of parallel shields extending transversely of the rolls lying atani acute angle to the glass and located between aI pair of said rolls below the level thereof; lighting means below the shutter, and a casing enclosing the shutter and lighting means.

'ing their upper surfaces provided with a dull flat nish and their lower surfaces with a light colored reflecting nish.

'7. In combination with a horizontal conveyor apartvand adapted'rto carry a glass sheet, inspection means vcomprising a shutter made up of aI series of parallel shields extending transversely*-g fof said parallel members lying at an acute angle to the glass sheet below `the level thereof, and 1 lighting Vmeans below the shutter.

DAVID H. BOGGS. 

